ref 021 "ADS-B Target Reports Expansion" edition 1.4 date 2018-03-08 compound 8 BPS "Barometric Pressure Setting" definition Barometric Pressure Setting group spare 4 BPS "Barometric Pressure Setting" element 12 unsigned quantity 1/10 "hPa" >= 0 <= 819/2 remark Notes: - BPS is the barometric pressure setting of the aircraft minus 800 hPa - A value of "0" indicates that in the aircraft a value of 800 hPa or less has been selected. - A value of "409.5" indicates that in the aircraft a value of 1209.5 hPa or more has been selected. SH "Selected Heading" definition Selected Heading group spare 4 HDR "Horizontal Reference Direction" element 1 table 0: True North 1: Magnetic North STAT "Selected Heading Status" element 1 table 0: Data is either unavailable or invalid 1: Data is available and valid SH "Selected Heading" element 10 unsigned quantity 45/2^6 "°" remark On many aircraft, the ADS-B Transmitting Subsystem receives Selected Heading from a Mode Control Panel / Flight Control Unit (MCP / FCU). Users of this data are cautioned that the Selected Heading value transmitted by the ADS-B Transmitting Subsystem does not necessarily reflect the true intention of the airplane during certain flight modes (e.g., during LNAV mode). NAV "Navigation Mode" definition Navigation Mode Settings group AP "Autopilot" element 1 table 0: Autopilot not engaged 1: Autopilot engaged VN "Vertical Navigation" element 1 table 0: Vertical Navigation not active 1: Vertical Navigation active AH "Altitude Hold" element 1 table 0: Altitude Hold not engaged 1: Altitude Hold engaged AM "Approach Mode" element 1 table 0: Approach Mode not active 1: Approach Mode active spare 4 remark This data-item should only be transmitted if an ADS-B indication has been received that the mode bits have been "actively populated".by the avionics (1090 ES version 2 (as defined in I021/210) BDS 6,2, subtype 1, bit 47: "Status of MCP / FCU Mode Bits") GAO "GPS Antenna Offset" definition GPS Antenna Offset element 8 raw remark The value of this field is copied from the respective bits 33-40 of version 2 (as defined in I021/210) of 1090 ES BDS register 6,5 (Aircraft Operational Status) SGV "Surface Ground Vector" definition Ground Speed and Track Angle elements of the Surface Ground Vector. extended STP "" element 1 table 0: Aircraft has not stopped 1: Aircraft has stopped HTS "" element 1 table 0: Heading/Ground Track data is not valid 1: Heading/Ground Track data is valid HTT "" element 1 table 0: Heading data provided 1: Ground Track provided HRD "" element 1 table 0: True North 1: Magnetic North GSS "Ground Speed" element 11 unsigned quantity 1/2^3 "kt" - HGT "Heading/Ground Track Information" element 7 unsigned quantity 45/2^4 "°" - STA "Aircraft Status" definition This item contains flags to convey information on the status of a target. extended ES "" element 1 table 0: Target is not 1090 ES IN capable 1: Target is 1090 ES IN capable UAT "" element 1 table 0: Target is not UAT IN capable 1: Target is UAT IN capable spare 5 - TNH "True North Heading" definition True North Heading (Element of Air Vector). element 16 unsigned quantity 360/2^16 "°" remark Magnetic Heading is defined in I021/152. MES "Military Extended Squitter" definition Contents of Extended Squitters transmitted by Military Aircraft compound SUM "Mode 5 Summary" group M5 "" element 1 table 0: No Mode 5 interrogation 1: Mode 5 interrogation ID "" element 1 table 0: No authenticated Mode 5 ID reply/report 1: Authenticated Mode 5 ID reply/report DA "" element 1 table 0: No authenticated Mode 5 Data reply or Report 1: Authenticated Mode 5 Data reply or Report (i.e any valid Mode 5 reply type other than ID) M1 "" element 1 table 0: Mode 1 code not present or not from Mode 5 reply/report 1: Mode 1 code from Mode 5 reply/report M2 "" element 1 table 0: Mode 2 code not present or not from Mode 5 reply/report 1: Mode 2 code from Mode 5 reply/report M3 "" element 1 table 0: Mode 3 code not present or not from Mode 5 reply/report 1: Mode 3 code from Mode 5 reply/report MC "" element 1 table 0: Flightlevel not present or not from Mode 5 reply/report 1: Flightlevel from Mode 5 reply/report PO "" element 1 table 0: Position not from Mode 5 report (ADS-B report) 1: Position from Mode 5 report remark Notes: 1. The flag M2 refers to the contents of Subfield #6 below, M3, MC refer to the contents of data items I021/070 and I021/145 respectively. The flag M1 refers to the contents of Subfield #3 below (Extended Mode 1 Code in Octal Representation). 2. If a Mode 5 reply/report is received with the Emergency bit set, then the Military Emergency bit (ME) in Data Item I021/200, Target Status, shall be set. 3. If a Mode 5 reply/report is received with the Identification of Position bit set, then the Special Position Identification bit (SPI) in Data Item I021/200, Target Status, shall be set. 4. If a Mode 5 report (ID or Data) is received and fullfill the autentication criteria the corresponding authentication bit shall be set. PNO "Mode 5 PIN / National Origin" group spare 2 PIN "PIN Code" element 14 raw spare 5 NO "National Origin Code" element 11 raw EM1 "Extended Mode 1 Code in Octal Representation" group V "" element 1 table 0: Code validated 1: Code not validated spare 1 L "" element 1 table 0: Mode 1 code as derived from the report of the transponder 1: Smoothed Mode 1 code as provided by a local tracker spare 1 EM1 "Extended Mode 1 Code in Octal Representation" element 12 string octal remark Notes: - Subfield #1 is present, the M1 bit in Subfield #1 indicates whether the Extended Mode 1 Code is from a Mode 5 reply or a Mode 1 reply. If Subfield #1 is not present, the Extended Mode 1 Code is from a Mode 1 reply. - If Subfield #3 is not present the Mode 1 Code was not reported or all Code Bits were equal to 0. - The valid bit is set if the Code was only reported once for that target. XP "X Pulse Presence" group spare 2 XP "X-pulse from Mode 5 PIN Reply/report" element 1 table 0: X-Pulse not present 1: X-pulse present X5 "X-pulse from Mode 5 Data Reply or Report" element 1 table 0: X-pulse set to zero or no authenticated Data reply or Report received 1: X-pulse set to one (present) XC "X-pulse from Mode C Reply" element 1 table 0: X-pulse set to zero or no Mode C reply 1: X-pulse set to one (present) X3 "X-pulse from Mode 3/A Reply" element 1 table 0: X-pulse set to zero or no Mode 3/A reply 1: X-pulse set to one (present) X2 "X-pulse from Mode 2 Reply" element 1 table 0: 0 X-pulse set to zero or no Mode 2 reply 1: X-pulse set to one (present) X1 "X-pulse from Mode 1 Reply" element 1 table 0: X-pulse set to zero or no Mode 1 reply 1: X-pulse set to one (present) remark Within Mode 5 reports, the X-Pulse can be set for the following cases: 1. In a combined Mode 1 and Mode 2 report: in this case the X5 bit and the X2 bit shall be set; 2. In a combined Mode 3 and Mode C report: in this case the X5 bit and the X3 bit shall be set; 3. In a Mode 5 PIN data report: in this case the X5 bit and the XP bit shall be set. The X1 bit and the XC bit are meaningless as in Mode 1 and Mode C replies/reports the X Pulse is not defined. They are kept for compatibility reasons. FOM "Figure of Merit" group spare 3 FOM "Figure of Merit" element 5 raw M2 "Mode 2 Code in Octal Representation" group V "" element 1 table 0: Code validated 1: Code not validated spare 1 L "" element 1 table 0: Mode-2 code as derived from the reply of the transponder 1: Smoothed Mode-2 code as provided by a local tracker spare 1 MODE2 "Mode 2 Code in Octal Representation" element 12 string octal remark If Subfield 6 is not present the Mode 2 Code was no reported or all Code Bits were equal to 0. remark Notes: - The Reserved Expansion Field is optional. When used to transmit MES, it shall be sent when the targets are represented by Mode 5 Level 2 reports. - The information contained in this data item is specific to 1090MHz Extended Squitter messages transmitted by military aircraft (Mode 5 Level 2 squitter).